US3701637A - Process for leaching strontium sulfide black ash - Google Patents

Process for leaching strontium sulfide black ash Download PDF

Info

Publication number
US3701637A
US3701637A US51113A US3701637DA US3701637A US 3701637 A US3701637 A US 3701637A US 51113 A US51113 A US 51113A US 3701637D A US3701637D A US 3701637DA US 3701637 A US3701637 A US 3701637A
Authority
US
United States
Prior art keywords
strontium sulfide
leaching
black ash
strontium
sulfide
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US51113A
Other languages
English (en)
Inventor
Jose L Arnaud
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CIA MINERA LA VALENCIANA A MEXICAN Co
Original Assignee
FMC Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by FMC Corp filed Critical FMC Corp
Application granted granted Critical
Publication of US3701637A publication Critical patent/US3701637A/en
Assigned to CIA. MINERA LA VALENCIANA, A MEXICAN COMPANY reassignment CIA. MINERA LA VALENCIANA, A MEXICAN COMPANY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: FMC CORPORATION A CORP. OF DE
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B17/00—Sulfur; Compounds thereof
    • C01B17/42—Sulfides or polysulfides of magnesium, calcium, strontium, or barium

Definitions

  • alkaline-earth metals such as barium, strontium, and the like can be recovered from black ash by leaching the alkaline-earth metal sulfide values from impurities present in the black ash.
  • Black ash is the product which is obtained when an alkaline-earth metal ore is reacted with carbon at temperatures above 1000" C. to convert the alkaline-earth metals to their sulfides.
  • the resulting product normally contains the corresponding metal sulfides, unreacted ore and various impurities. For economic operation it is necessary to extract a relatively large proportion of the metal sulfides from this mass.
  • the extraction of a metal such as barium in the form of its barium sulfide can easily be achieved in a single stage leaching process by treating the black ash with water and removing a barium sulfide solution containing up to 22%, by weight, barium sulfide.
  • This one stage leaching operation is easily carried out at extremely high efiiciencies on the order of 95% and above.
  • serious obstacles present themselves.
  • the major difficulty is that the strontium sulfide extraction etficiencies are very low when workable and economic concentrations of strontium sulfide are obtained for further processing, e.g.
  • strontium sulfide 14% by weight strontium sulfide or above. If more than one extraction stage is utilized to leach out the strontium sulfide to its maximum solubility in each stage, the efficiency improves, but still is very low, resulting in large quantities of strontium sulfide remaining behind in the black ash. Retention of 30% or more of the strontium sulfide values in the black ash is not uncommon. As a consequence, commercial leaching operations for recovering strontium sulfide, has been seriously hampered by the relatively poor recovery of strontium values from a strontium black ash.
  • strontium sulfide values can be leached from strontium sulfide black ash so that at least of the strontium sulfide values are removed from the black ash in a plurality of leaching stages by treating the black ash in at least one leaching stage (except the product extract stage) with an aqueous solvent so as to obtain an extract having no more than 12% by weight of strontium sulfide; in the product extract stage, where the highest concentration of strontium sulfide is obtained, the maximum concentration of the extract can be up to 21% by weight strontium sulfide.
  • FIG. 1 a diagrammatic flow plan of an embodiment of the invention is shown.
  • FIG. 2 is a graph showing the percent (by weight) metal sulfide leached from black ash (or leaching efficiency) versus the concentration of the leach liquor, for both barium sulfide and strontium sulfide.
  • the strontium sulfide black ash which is treated in accordance with the present invention can be prepared by a number of techniques.
  • One which is conventionally used is to treat a strontium ore, which normally contains strontium in the form of strontium sulfate, by suitably grinding the ore and subsequently reacting the ground ore with coke in a furnace at temperatures in the order of 1000 C. or above.
  • the product of this reaction is termed black ash and is an impure strontium sulfide product mixture. This mixture contains impurities and unreacted compounds which must be separated from the strontium sulfide values which are desired. It is desired to make clear that the present invention does not include any process for producing the black ash and that any suitably obtained black ash may be processed in accordance with the present invention.
  • the black ash is treated with an aqueous solvent in countercurrent fashion in a plurality of leaching stages. This can best be described by reference to FIG. 1 of the drawings.
  • the black ash containing strontium sulfide values flows through conduit 2 into an extractor 4, along with a strontium sulfide aqueous leach liquor through conduit 6, and are kept in intimate contact by mixer 30 in the extractor.
  • extractor 4 a portion of the strontium sulfide values in the black ash are extracted and the mixture in extractor 4 is passed through line 8 into settler 10.
  • the aqueous extract from this initial extraction stage can range up to a maximum concentration of about 21% by weight of strontium sulfide.
  • the concentration of the product extract which comes from this initial stage and which is removed through line 12 has a concentration of from about 14 to about 18% by weight strontium sulfide.
  • the product extract which is removed through line 12 is then forwarded for processing of the strontium sulfide to strontium carbonate or other strontium salts as desired.
  • the settled solids in settler 10 are passed by line 14 to a second extraction stage in extractor 16.
  • extractor 16 the black ash is mixed with hot water which is admitted through line 24 and they are kept in intimate contact by mixer 32 in the extractor.
  • the slurry from the second extraction stage, extractor 16 is then passed by line 18 into a second settler 20.
  • the extract from this stage is removed from settler 20 by line 6 to extractor 4.
  • strontium sulfide extract It is essential that during the extraction in extractor 16 and settler 20 that the strontium sulfide extract have a concentration no greater than about 12% by weight of strontium sulfide.
  • the settled solids in settler 20 are passed by line 22 to a dewatering filter 26, to remove the last traces of the aqueous solvent containing leached strontium sulfide values.
  • the filtrate is then passed through line 28 to extractor 16 to serve as part of the extraction liquor for extracting black ash in extractor 16.
  • FIG. 2 there is plotted on the horizontal axis the percent, by weight, of strontium sulfide leached (which also may be termed leaching efliciency), while on the vertical axis there is plotted the concentration of strontium sulfide in the extract.
  • the concentration of strontium sulfide in the extract As will be readily observed, if extraction of strontium sulfide is attempted where the concentration of the extract is greater than about 12%, thepercent strontium sulfide leached (or leaching efliciency) decreases very sharply with very small increases in concentration of the extract.
  • the leaching can be carried out at any temperature up to the boiling point of the extract. Higher temperatures are preferred because they permit working with higher concentrations of strontium sulfide.
  • a preferred tempera- .ture for operation is from about 85 to about 100 C.
  • EXAMPLE 1 A black ash containing 76% by weight of strontium sulfide was leached in an apparatus as shown in FIG. 1 at a temperature of about 100 C.
  • the numbers used in FIG. 1 to identify the pieces of equipment will be used herein to identify the apparatus and feed streams employed.
  • the black ash was passed at a rate of 100 pounds per minute (lbs/min.) through conduit 2 into extractor 4, along with 725 lbs/min. of a 6.5% by weight aqueous extract of strontium sulfide through conduit 6.
  • extractor. 4 the ingredients were mixed in intimate contact by means of an impeller 30.
  • the overflow from extractor 4 flowed into a primary settler 10. After allowing the agitated mixture to settle, 556 lbs/min.
  • the settled slurry from settler, 20 was removed through conduit 22 at a rate of 128 lbs/min. and passed to a dewatering filter 26.
  • the slurry contained 96 lbs. of water, 6.5 lbs. of leached strontium sulfide, 1.5 lbs. of unleached strontium sulfide and 24 lbs. of inert matter per 128 lbs. of slurry.
  • the slurry after being filtered on a dewatering filter 26, yielded per minute, a filter cake containing 24 lbs. of inert matter, 0.75 lb. of unleached strontium sulfide, 0.7 5 lb. of leached strontium sulfide and residual water.
  • a process of leaching strontium sulfide values from a strontium sulfide black ash with an aqueous solvent in a plurality of leaching stages comprising passing black ash and an aqueous solvent countercurrently to one another and contacting each other in a plurality of leaching stages to obtain a final extract in a product extract stage having a maximum concentration of about 21% by weight of strontium sulfide, treating said black ash in at least one of said leaching stages except the product extract stage with a suflicient amount of water to obtain a strontium sulfide-containing extract having not more than 12% by weight strontium sulfide, whereby at least of the strontium sulfide values are leached from said black ash in said at least one stage.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Extraction Or Liquid Replacement (AREA)
  • Processing Of Solid Wastes (AREA)
US51113A 1970-06-30 1970-06-30 Process for leaching strontium sulfide black ash Expired - Lifetime US3701637A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US5111370A 1970-06-30 1970-06-30

Publications (1)

Publication Number Publication Date
US3701637A true US3701637A (en) 1972-10-31

Family

ID=21969430

Family Applications (1)

Application Number Title Priority Date Filing Date
US51113A Expired - Lifetime US3701637A (en) 1970-06-30 1970-06-30 Process for leaching strontium sulfide black ash

Country Status (8)

Country Link
US (1) US3701637A (es)
JP (1) JPS5515406B1 (es)
CA (1) CA943771A (es)
DE (1) DE2132592C3 (es)
ES (1) ES392681A1 (es)
FR (1) FR2096606B1 (es)
GB (1) GB1318125A (es)
NL (1) NL7108944A (es)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108793086A (zh) * 2018-07-23 2018-11-13 贵州红星发展股份有限公司 碱土金属硫化物的浸取方法和浸取装置
CN114939286A (zh) * 2022-07-05 2022-08-26 广西来宾市国宏钙业科技有限公司 一种连续浸取装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108793086A (zh) * 2018-07-23 2018-11-13 贵州红星发展股份有限公司 碱土金属硫化物的浸取方法和浸取装置
CN114939286A (zh) * 2022-07-05 2022-08-26 广西来宾市国宏钙业科技有限公司 一种连续浸取装置

Also Published As

Publication number Publication date
DE2132592B2 (de) 1974-01-10
NL7108944A (es) 1972-01-03
ES392681A1 (es) 1974-11-16
GB1318125A (en) 1973-05-23
JPS5515406B1 (es) 1980-04-23
DE2132592C3 (de) 1982-05-06
FR2096606A1 (es) 1972-02-18
CA943771A (en) 1974-03-19
DE2132592A1 (de) 1972-01-05
FR2096606B1 (es) 1974-03-08

Similar Documents

Publication Publication Date Title
US2576314A (en) Extracting of nickel values from nickeliferous sulfide material
US3104950A (en) Process for the separation of iron and titanium values by extraction and the subsequent preparation of anhydrous titanium dopxode
US3712939A (en) Method for recovering tantalum and/or columbium
US3429693A (en) Extraction of metals
US3458277A (en) Process for the recovery of molybdenum values as high purity ammonium paramolybdate from impure molybdenum-bearing solution,with optional recovery of rhenium values if present
US4389248A (en) Method of recovering gold from anode slimes
US5023059A (en) Recovery of metal values and hydrofluoric acid from tantalum and columbium waste sludge
US4153522A (en) Sulfate precipitation during oxidative ammonium leach of Cu, Ni, Zn sulfide ores
US3973949A (en) Zinc recovery by chlorination leach
US3752745A (en) Recovery of metal values from ocean floor nodules
US4247522A (en) Method of purifying uranium tetrafluoride hydrate and preparing uranium (VI) peroxide hydrate using a fluoride precipitating agent
US3709680A (en) Process for removal of arsenic from sulfo-ore
US3701637A (en) Process for leaching strontium sulfide black ash
US4054638A (en) Process for treating residues from the electrolytic processing of zinc, by recovery of the metals therein
US2869979A (en) Slurry solvent extraction process for the recovery of metals from solid materials
US3177068A (en) Recovery of beryllium from bertrandite ore
US3146063A (en) Process for separating scandium from mixtures containing scandium and thorium values
US4053552A (en) Solvent extraction of zinc from sulfite-bisulfite solution
CN108862382B (zh) 一种从铅钒矿中提取高纯五氧化二钒的方法
US3174821A (en) Purification of yellow cake
US4668495A (en) Process for obtaining potassium nitrate from potassium chloride and nitric acid
US5026530A (en) Method for producing copper arsenate compositions
US4302428A (en) Yellowcake processing in uranium recovery
US3330649A (en) Upgrading manganese ores using hf and hsif as leaching materials
US3408161A (en) Production of purified wet process phosphoric acid from phosphate rock

Legal Events

Date Code Title Description
AS Assignment

Owner name: CIA. MINERA LA VALENCIANA, S.A. BLVD. REVOLUCION 8

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:FMC CORPORATION A CORP. OF DE;REEL/FRAME:004294/0800

Effective date: 19840727